How to draw 3D bar graph of Z for specified value of X and Y.

Dear all, I want to plot a 3D bar graph for a given X, Y and Z row matrix. Actually I want to plot bar of Z for a specified coordinate of X and Y in X-Y plane. How to plot it please help me

[Julie]

So do you have multiple Z values for each X and Y?

[Shashibhushan Sharma]

yes multiple z value for multiple values of X and Y.

Answer 1

[Dimitris Kalogiros]

I thing you should use stem3 command.

Have a look at the following example:

clear; close all; clc;

x = 0:1:10;
y = exp(2:-0.2:0);
z=sqrt(x)+2*((y.^2).^(1/3));

stem3(x,y,z, '-b','LineWidth',4);
xlabel('x'); ylabel('y'); zlabel('z');
zoom on; grid on;

stem3() produced "bar like" 3D graphs

[Shashibhushan Sharma]

Sir, thanks for your help. I plot the stem for all z value under all x and all y with the help of for loop and most of bars collide. Someone can not distinguish between the curves. There are the code

clear; close all; clc ;

x1 = 0:1:10 ; y1 = 2:12; z=zeros(length(x1),length(y1)); for q=1:length(x1) x=x1(q); for w=1:length(y1) y=y1(w); z(q,w)=sqrt(x)+2*((y.^2).^(1/3 )); end end stem3(x1,y1,z, '-b','LineWidth',4); xlabel('x'); ylabel('y'); zlabel('z '); zoom on; grid on;

if all bar lines are in color then it will good. Can we make the all bars in different color?

[Dimitris Kalogiros]

clear; close all; clc ;

% definition of x, y
x1 = 0:1:10 ;
y1 = 2:12;

% define a set of colors
rng(8881);
colorSet=[rand(1,length(x1)); (length(x1):-1:1)/length(x1); rand(1,length(x1))]';

% definition of z
z=zeros(length(x1),length(y1));
for q=1:length(x1)
    x=x1(q);
    for w=1:length(y1)
        y=y1(w);
        z(q,w)=sqrt(x)+2*((y.^2).^(1/3 ));

          %color depends on x value
          stem3(x,y,z(q,w), '-b','color',colorSet(q,:),'LineWidth',4);
          hold on;
      end
  end

xlabel('x'); ylabel('y'); zlabel('z ')
zoom on; grid on;

[Shashibhushan Sharma]

Thank you sir, but still one question arise that why do we not plot it in bar graph.

Answer 2

[Shashibhushan Sharma]

We can plot 3D bar graph in MATLAB for specific values of x and y as:

clearvars;close all;clc; x1=1:10;y1=0:0.1:1;z=zeros(length(y1), length(x1)); for a=1:length(x1) x=x1(a); for b=1:length(y1) y=y1(b); z(b,a)=((1/x)^2)+exp(y); end end bar3( z (:,:,1)); set(gca,'XTickLabel',x1) set(gca,'YTickLabel',y1)